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Alacranite Reference Libraries

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Orpiment
2005-05-26 08:34:39

Orpiment is a common monoclinic crystalline mineral - Chemical Composition: As2S3, arsenic trisulfide - Molecular Weight: 246.04 gm - Hardness: 1.5-2 - Optical refractive index: Biaxial (-), a=2.4, b=2.81, g=3.02 Orpiment is a mineral that is found world-wide, and occurs as a sublimation product in volcanic fumaroles, low temperature hydrothermal veins, hot springs and as a...

Realgar
2005-05-25 18:45:54

Realgar is a mineral of arsenic sulfide, AsS. Realgar, orpiment, and arsenopyrite provide nearly all the world's supply of arsenic as a byproduct of smelting concentrates derived from these ores.

Word of the Day
prosopography
  • a study of the individuals in a group of people within a specific context and their relationships.
  • In rhetoric, the description of any one's personal appearance.
The word 'prosopography' comes from a Latin word meaning 'description of a person’s appearance' from Greek roots meaning 'face' or 'person' and 'writing'.